Reasons For

The Acer G227HQL has a screen size of 21.5", whereas the Hannspree HE196APB is only an 18.5" PC monitor (3" smaller).
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The display diagonal is a measure of the size of the monitor. It is measured from one corner of the screen to the diagonally opposite corner of the screen.

A bigger display diagonal means that the screen will be larger and better for displaying lots of content or for seeing the detail in photos and videos.

7.6cm bigger display diagonal
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The Acer G227HQL has a display diagonal of 54.6cm, whereas the Hannspree HE196APB is only a 47cm display diagonal PC monitor (7.6cm smaller).

50 cd/m² brighter display brightness
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The Acer G227HQL has a display brightness of 250 cd/m², whereas the Hannspree HE196APB is only a 200 cd/m² display brightness PC monitor (50 cd/m² dimmer).

25% faster response time
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The Acer G227HQL is a 4ms response time PC monitor. That's 1ms faster than the Hannspree HE196APB (5ms).
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The response time on a PC monitor is a measure of how quickly the monitor reacts to image data sent by the computer's graphics card. Fast response times are particularly important for gamers, who should ideally look for a response time of 8 milliseconds or less.

A faster (shorter) response time is better because fast moving graphics will appear smoother and the gaming experience will feel more responsive.

12% lower power consumption when off
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The Acer G227HQL has a power consumption when off of 0.45W, however the Hannspree HE196APB is a 0.5W power consumption when off PC monitor (0.05W higher).

4 Reasons For

A bit lighter
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The Hannspree HE196APB has a weight of 2.3kg, however the Acer G227HQL is a 2.5kg weight PC monitor (200g heavier).

Cheaper by £33

The Hannspree HE196APB costs £32.53 less than the Acer G227HQL.

20 shops are selling it

A greater number of shops increases the chances of the product remaining in stock and also increases the price competition amongst retailers for this PC monitor.

15% cheaper to run

Over five years the Hannspree HE196APB is £6.35 cheaper to run than the Acer G227HQL.
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The Hannspree HE196APB has a response time of 5ms, but the Acer G227HQL is a 4ms response time PC monitor (1ms faster).
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The response time on a PC monitor is a measure of how quickly the monitor reacts to image data sent by the computer's graphics card. Fast response times are particularly important for gamers, who should ideally look for a response time of 8 milliseconds or less.

A faster (shorter) response time is better because fast moving graphics will appear smoother and the gaming experience will feel more responsive.

10% higher power consumption when off
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The Hannspree HE196APB is a 0.5W power consumption when off PC monitor. That's 0.05W higher than the Acer G227HQL (0.5W).